Barry McCarthy's six-wicket haul made it a weekend to forget for Phoenix as they were bundled out for 113 against Pembroke. Merrion crush Leinster, The Hills beat Rush and YMCA edge out Malahide.
Irish international McCarthy had the excellent analysis of 6 for 25, while skipper Fiachra Tucker took 3 for 10 as Phoenix were dismissed for 113 chasing 145.
In the Pembroke innings, Andy Balbirnie top scored with 40, while McCarthy (36), Shaheen Khan (23) and Jack Balbirnie (20) all chipped in, while there were three wickets apiece for Poonish Mehta and Simi Singh.
A second wicket stand of 277 between centurions Dom Joyce and John Anderson helped Merrion amass a daunting total of 384 for 7.
Joycee hit 17 fours and 4 sixes on his way to 147 from134 balls, while Anderson's 130 included 13 fours and 4 sixes, taking 125 deliveries.
Max Sorensen hit 31 while pinch hitter Dave Langford-Smith hit seven boundaries in a quickfire 29.
Bilal Azhar (4-44) escaped the carnage relatively unscathed, while Hardus Venter also claimed three wickets.
The shell-shocked Leinster side were then skittled for just 70, with James Groom (3-25) and Max Sorensen (2-4) among the wickets.
Cup winners The Hills were 96-run winners (DLS) against Rush in a rain interrupted contest at Milverton.
An opening stand of 174 between Cormac McLoughlin-Gavin (87) and Bhavest Lakhotia (80) set them on their way to 243 for 2 in 39 overs.
Set 288, Rush were dismissed for 184 with Allan Eastwood top scoring with 39, while there were also contributions from Neil Rock (35), Jarred Barnes (31) and Jurie Snyman (24).
Skipper Tomas Rooney-Murphy and Greg Lamb claimed two wickets apiece.
Closest game of the day saw YMCA stage another come from behind win as they beat Malahide in the last over.
James Parkinson's 36 not out getting them over the line as they chased a DLS target of 197 in 36 overs.
Despite missing the Tector brothers, YM prevailed as Rory Anders made 41, Mitchell Thompson (23*) and 20 each from Wilhelm De Klerk and Bobby Gamble.
Earlier, Malahide's 231 for 7 was based around a fine century for Fintan McAllister, who hit 11 fours and 3 sixes in his 112-ball innings.
Matt Ford (35), Anish Desai (28) and Callum Riches (23) were also among the runs, while Fionn Hand (2-34) was the pick of the attack.